Minehillite Mineral Data

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General Minehillite Information

Chemical Formula:

(K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16

Composition:

Molecular Weight = 4,786.44 gm

Potassium 1.55 % K 1.87 % K₂O

Sodium 0.14 % Na 0.19 % Na₂O

Calcium 23.03 % Ca 32.22 % CaO

Magnesium 0.05 % Mg 0.08 % MgO

Manganese 0.11 % Mn 0.15 % MnO

Aluminum 2.48 % Al 4.69 % Al₂O₃

Zinc 6.56 % Zn 8.16 % ZnO

Iron 0.12 % Fe 0.15 % FeO

Silicon 23.12 % Si 49.46 % SiO₂

Hydrogen 0.32 % H 2.86 % H₂O

Oxygen 42.52 % O

______ ______

100.00 % 99.83 % = TOTAL OXIDE

Empirical Formula:

K_1.9Na_0.3Fe²⁺_0.1Mg_0.1Mn²⁺_0.1Ca_27.5Zn_4.8Al_4.4Si_39.4O₁₁₂(OH)_15.2

Environment:

Secondary low-temperature mineral found in a metamorphosed stratiform zinc deposit.

IMA Status:

Approved IMA 1984

Locality:

Mine Hill at Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Minehillite + Pronunciation

Synonym:

ICSD 79739

PDF 38-371

Minehillite Image

Images:

Minehillite Margarosanite Wollastonite-1A

Comments: White pearly crystalline minehillite with white margarosanite and dark gray lead, in pale pink opaque wollastonite (distinguished by blue-white fluorescence).
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Minehillite Crystallography

Axial Ratios:

a:c = 1:3.40523

Cell Dimensions:

a = 9.777, c = 33.293, Z = 1; V = 2,756.10 Den(Calc)= 2.88

Crystal System:

HexagonalSpace Group: P 6₃/mmm, P 62c, or P 6₃mc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.764(1), 1.847(0.9), 16.1(0.7),

Crystal Structure:

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Dai Y S , Post J E , Appleman D E , American Mineralogist , 80 (1995) p.173-178, Crystal structure of minehillite: Twinning and structural relationships to, reyerite

Physical Properties of Minehillite

Cleavage:

{0001} Perfect

Color:

Colorless, Gray white, Grayish black, White.

Density:

2.93

Diaphaneity:

Transparent

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4 - Fluorite

Luminescence:

Fluorescent, Short UV=dull violet, Long UV=dull violet.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Minehillite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2102,KPDmeas= 0.2067,KC= 0.2076
Ncalc = 1.6 - 1.61

Optical Data:

Uniaxial (-), e=1.604, w=1.607, bire=0.0030.

Calculated Properties of Minehillite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Minehillite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Minehillite= 7.17 barns/electron
U=PE_Minehillite x r_electron= 20.91 barns/cc.

Radioactivity:

GRapi = 22.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Minehillite per GRapi unit = 4.49 (%)

Estimated Radioactivity from Minehillite - barely detectable

Minehillite Classification

Dana Class:

73.02.02b.01 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.02)with double and single layers

(73.02.02b)Reyerite group (Minehillite Subgroup)

73.02.02b.01 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

73.02.02b.02 Orlymanite Ca4Mn3Si8O20(OH)6•2(H2O) P 3-,P 3 Trig

Strunz Class:

09.EE.75 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.75 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

Other Minehillite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Minehillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Minehillite Specimen Label here :

Minehillite

(K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16
Dana No: 73.02.02b.01 Strunz No: 09.EE.75
Locality:

Notes: